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YouTube may take a stab at long-form video; Philly gets a second try at muni Wi-Fi; and Corvettes lead the Daniel Terdiman road show.

YouTube's playing cute, but word is that the Google subsidiary is testing longer videos that would be more attractive to Madison Avenue. That would be a huge shift, and CNET's Greg Sandoval explains why.

Philadelphia thought its nascent plan to build a city-wide Wi-Fi operation was going to be stillborn. But at the very last minute, a group of investors has emerged to take control.'s Daniel Terdiman continues his tech tour of the southern U.S., and he made a recent pit stop at the factory that makes the Corvette.

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Today's stories:

Stats show Firefox spreading fast

IBM's Roadrunner breaks petaflop barrier, tops supercomputer list

Microsoft to buy TV ad service

LinkedIn gets its billion-dollar valuation

How a Corvette gets built